66021620054 has 8 divisors (see below), whose sum is σ = 106650309360. Its totient is φ = 30471516936.

The previous prime is 66021620051. The next prime is 66021620057. The reversal of 66021620054 is 45002612066.

It is an interprime number because it is at equal distance from previous prime (66021620051) and next prime (66021620057).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×66021620054³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66021620054.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66021620051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1269646514 + ... + 1269646565.

It is an arithmetic number, because the mean of its divisors is an integer number (13331288670).

Almost surely, 2^66021620054 is an apocalyptic number.

66021620054 is a deficient number, since it is larger than the sum of its proper divisors (40628689306).

66021620054 is a wasteful number, since it uses less digits than its factorization.

66021620054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539293094.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 66021620054 in words is "sixty-six billion, twenty-one million, six hundred twenty thousand, fifty-four".